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Paz acknowledged those concerns but emphasized that creating recreation areas would include hardening surfaces, planting trees and greenery, and being “really intentional about keeping dust down.”

Being trialled is also an autonomous water cart affectionately known as Henry, which, along with manually driven ones, sprays the mine roads to keep the dust down.

They said they would keep the dust down by minimizing the grading of the land.

On Thursday, half a mile from Boron’s Little League field, a construction crew, wearing yellow vests, was building a fence at the edge of the site, while a truck sprayed water, trying to keep the dust down.

"They can get stuck. But on the plus side, it will keep the dust down, which is good for the equipment."